H8SSLASH2218 datasheet(271/750 Pages) RENESAS

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Section 8 I/O Ports

Rev.6.00 Jun. 03, 2008 Page 223 of 698

REJ09B0074-0600

8.2

Port 3

The port 3 is a 4-bit I/O port also functioning as the SCI I/O pins and external interrupt input

(

IRQ4) pins. The port 3 of the H8S/2218 Group has the same function as that of the H8S/2212

Group. The port 3 has the following registers.

• Port 3 data direction register (P3DDR)

• Port 3 data register (P3DR)

• Port 3 register (PORT3)

• Port 3 open-drain control register (P3ODR)

8.2.1

Port 3 Data Direction Register (P3DDR)

P3DDR specifies input or output for the pins of the port 3.

Since P3DDR is a write-only register, the bit manipulation instructions must not be used to write

P3DDR. For details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.

Bit

Bit Name Initial Value

R/W

Description

⎯

Undefined

⎯

Reserved

This bit is undefined and cannot be modified.

P36DDR

Setting a P3DDR bit to 1 makes the corresponding port 3

pin an output pin, while clearing the bit to 0 makes the pin

an input pin.

5 to

⎯

Undefined

⎯

Reserved

These bits are undefined and cannot be modified.

P32DDR

P31DDR

P30DDR

Setting a P3DDR bit to 1 makes the corresponding port 3

pin an output pin, while clearing the bit to 0 makes the pin

an input pin.

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